Metal boring tool



Oct. 3, 1944.

E. GAlRlNG METAL BORING TOOL Filed Oct. 11, 1943 Bnnentor Gtfomeg Patented st. 3, 1944 UNITED STATES PATENT OFFICE METAL BORING TOOL Emil Gflrlnl, Detroit, Mich.

Application October 11, 1943, Serial No. 505,713

is My invention relates to a metal boring tool, ,,shown in the accompanying drawing and more particularly described in the following specification and claims. In the drawing:

Figure l is a perspective view of the assembled tool; with its removable cutter-blade looked in position.

Figure 2' is a perspective view of the pilot removed from the body of the tool; showing its bifurcated stem; between the spaced walls of which is lodged a cutter-blade, when the several parts are in assembled relation, as shown in Figure 1.

Figure 3 is a perspective view of an expanding bolt; which extends through a tapering, slightly inclined, transverse opening between the forked, or bifurcated walls of the pilot-stem; the bolt being screw-threaded at one end to engage the body of the tool.

Figure 4 is a cross-sectional view taken along line 4-4 of Figure l; drawn along the axis of the expanding bolt, the latter being shown in position, between the forked walls of the pilotstem, its upper screw-threaded portion engaging the body of the tool.

Figure 5 is a perspective view of the cutterblade; formed with a beveled-face on opposite sides of the blade, to provide recessed ledges to adapt it for interlocking relation between the bifurcated pilot-stem and the body of the tool.

Figure 6 is a cross-sectional view taken along the line 6-8 of Figure 1; showing the slot between the spaced walls of the forked pilot-stem aligned with the transverse slots through the annular wall of the tool; and in position to release the blade from locked relation with the tool body.

Figure 7 is a fragmentary perspective view of the tool assembly, with parts in section, taken along the line 1-1 of Figure 1, showing the cutting-blade locked in the body of the tool through a slight rotative movement of the forked stem of the pilot in relation to the tool body; whereby the edge of the walls of the bifurcated or forked stem may enter the notched recesses of the cutterblade.

The primary object of the present invention is to provide a simple inexpensive cutter-blade for a boring tool, which may be easily installed or removed from the body of the tool, either for replacement, sharpening, or repairs, and which may be quickly and securely locked in the tool-body.

A further object is to provide a tool-body 0 I relatively few parts, of simple and inexpensive construction, and which is adapted to secure the cutter-blade against displacement incidental to feeding, or side-wall pressure.

Referring now to the reference characters indicated upon the drawing;

Numeral i, denotes the body of the tool, and 2, its shank. A pilot I, having an integral bifurcated stem or shank 4, is axially lodged within the tool body and is secured in the body by a tapering bolt 5 screwed through a threaded opening l formed diametrically of the body and having a tapered portion 5 extending through a slightly inclined transverse tapering bore 6, formed in the opposing spaced walls 4, 4, of the pilot shank. A cutter-blade I, which may have tungsten steel or other suitable metallic cutting edges l has an inclined face, on each side of the blade; forming ledges 1 --'I which are adapted to receive the peripheral edges of the opposing walls 4M of the bifurcated shank of the pilot.

A slight rotative adjustment of the tapering bolt 5, in the inclined bore 6, of the pilot shank, serves to rotate, or rock from the position of Figure 6 the bifurcated pilot shank, forcing the walls 4 of the shank into the notched recesses formed in the cutter-blade 1 where their edges engage shoulders I", as clearly shown in Figure 7, of the drawing; thereby automatically centralizing the blade against transverse displacement and effecting a positive interlocking relation between the body of the tool, the cutter blade, and further effecting the expansion of the bifurcated shank of the pilot by means of the tapering bolt.

To replace the blade, or to remove it for sharpening; the bolt is partially unscrewed to shift its tapered portion 5 outwardly and the pilot-shank is turned in respect to the body of the tool, so that the slot 8, in the head of the tool body is aligned with the slot 4* between the walls in the pilot shank, as shown in Figure 6, of the drawing; when so positioned the cutter blade may be readily removed, or replaced in the body of the tool. The fact that the portion 5 of the bolt I is tapered and passes through the tapered bore 6 insures proper positioning of the walls of the shank 4 in the recesses at opposite sides of blade I as the bolt is screwed inwardly and also causes expansion of the shank 4 so that it has binding engagement with walls of the bore or socket or the body I in which it fits.

The degree of rotative adjustment required of the pilot shank in relation to the recesses in the cutter-blade may be readily determined; for

transversely locking, centralizing. or releasing the cutter blade from the body of the tool.

What I claim is:

1. In a boring tool, an annular body portion having a longitudinal transverse slot through the body portion; a pilot having a longitudinally slotted stem, axially sleeved in the annular body or the tool, whereby th slot in the body of the tool, and the slot between the walls or the pilotstem may be aligned upon relative rotation to receive between their respective walls a cutter blade; and a cutter blade having recesses formed in the side oi the blade to receive the opposing walls of the pilot stem, upon a relative rotation between the body of the tool and the pilot stem, to elect interlocking relation between said parts.

2. In a boring tool, an annular body portion having a longitudinal transverse slot through the wall of the body portion; a pilot having a longitudinally slotted stem, axially sleeved in the annular body of the tool. whereby the slot in the body of the tool, and the slot between the walls of the pilot-stem may be aligned upon rotation to receive between their respective walls a cutterblade: a cutter blade lodged in the slots of said body portion and pilot stem, having recesses on each side of the blade to receive the opposing walls of the pilot stem upon a relative rotation of the body of the tool and the pilot stem, to eilect an interlocking relation between said parts; and a tapering expanding bolt, extending through a tapering bore in the opposing walls of the longitudinally slotted pilot stem, having an adiustable screwthreaded connection with the body of the tool.

3. In a boring tool, an annular body portion having a longitudinal transverse slot through the tool body; a pilot having a longitudinally slotted stern axially sleeved in the annular body of the tool, whereby the slot in the body of the tool and the slot between the opposing walls of the pilot stem may be aligned to receive or remove a cutter blade; a cutter blade having inclined faces on each side oi the blade to provide ledges, adapted to receive the opposing walls 01' the pilot stem, when rotated into engaging interlocking relation therewith; and an adjustable tapering expanding bolt extending transversely through the tool body and between and through an inclined bore in the opposing walls of the pilot stem, whereby upon a rotative adjustment of said bolt in the wall of the tool body, the pilot stem may be actuated to automatically centralize and interlock the cutter blade in the pilot stem, and in the tool body.

4. In a boring tool, an annular body portion having longitudinal transverse slots through the annular body of the tool; a pilot having a longitudinal slotted stem axially sleeved in the tool rbody,wherebytheslotsinthebodyoithetool andtheslotbetweentheopposingwallsoithe pilotstemmay bealigned,toreceiveorremove a cutter-blade; a cutter-blade having recessed ledgesoneaehsideoltheblsdetoreceivethe opposing walls of the pilot stesn tor interlocking connection therewith; and an adjustable expanding bolt extending transversely through the annularwalloi thetoolbody,andthroughandbetween the opposing walls of the pilot stem, whereby the walls of the pilot stem when interlocked with the recused ledges oi the cutter-blade may be expanded into locked relation with the annular wall of the tool body.

5.Inaboringtool,ananmilarbodyportion having a longitudinal transverse slot through the walloithebodyportion; apilothavingalong'itudinally slotted stem, axially sleeved in the annuiarbodyoithetoohwherebytheslotinthe body of the tool, and the slot between the walls or the pilot-stem may be aligned upon rotation to receive between their respective walls a cutterblade; a cutter-blade lodged in the slots of the body portion and pilot stem, having recesses on each side oi the blade to receive the opposing walls oi the pilot stem upon a relative rotation ofthebodyoithe toolandthepilotstermtoeifeet an interlocking relation between said parts; and a tapering expanding bolt, extending through a tapering bore in the opposing walls of the lon tudinally slotted stem, having an adjustable screw-connection with the body of the tool, whereby upon adjusting said bolt, the opposing walls of the pilot stem may be expanded to eilect an interlocking relation between the pilot stem and the annular body of the tool.

6. In a boring tool, an annular body portion, having longitudinal transverse slots through the 40 body of the tool; a pilot having a longitudinally slotted stem axially sleeved in the tool body, whereby the slots, in the body of the tool and the slot between the opposing walls of the pilot stem may be aligned to receive or remove a cutter blade; a cutter blade having recessed ledges on each side of the blade to receive the opposing walls of the pilot stem in interlocking relation; and an adjustable expanding bolt extending transversely through the tool body, and through and between the walls of the pilot stem, whereby on aligning the slot between the opposing walls of the pilotstem with the transverse slots in the tool body, the walls of the stem may be expanded into locked relation with the annular wall of the tool body, and interlocked in the recessed ledges of the cutter blade.

EMIL GAIRING. 

